Northern Chinese or Indian giant Flying Squirrel ?

This flying squirrel was seen at night near Ruoergai in a coniferous forest in a place they called Baxi (a local nature reserve) in Northern Sichuan province. This was at about 3,200 m at the upper limit of the forest. It has an all black tail, light underside and light and is a large sized flying squirrel (i.e. two times bigger than a north American grey squirrel) . The local guide had no idea what species this was but we thought it might be Northern Chinese Flying Squirrel Aeretes melanopterus or Indian giant flying squirrel. Any ideas?

It doesn’t look like any Indian Giant Flying Squirrel I have seen. Indian Giant Flying Squirrels are also very large – cat sized – and this seems like it ought to be smaller. I haven’t seen Aeretes melanopterus but it seems to fit this quite well. Did you also consider Petaurista caniceps?